???? ????? ????? PN16 ???? ?????? ????? ?????
?? ???? ????? ????? PN16 ???? ????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?? ?? ????? ????? ?????? ?? ??? ????? ??????? ????? ?? ???? ????????. ?? ????? ??? ?????? ?????? ??? ??? ???? ????? ??? ????? ?? ???????? ?? ??? ??????? ??? ????? ?????? ??????? ?????? ????????? ???????? ?????????. ???? ???? ????? ????? PN16? ??????? ?? ???? ????? ??????? ??????? ??????? ??? ????? ?????? . ???? ?????? ????????? ?? ????? ??????? ??????? ?????? ???????? ?? ???????? ?????? ?????? ??????? ?????? ??? ???? ?????? ??? ????? ?????? ????? ???? ???????? ?????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?????? ????? ??????? ?????? ????? PN16. ?????? ??? ???????. ???? ??????? ?????? ?????? ??????? ????????? ??????? ???????? ???? ??????? ?????? ?? ???? ???????? ??? ?????? ?????? ???????? ?????? ?? ????? ?????? ???.